Sanders, an independent who caucuses with the Democrats in the Senate, wasn't done with McDonald's after sending that tweet, however. Sanders then tweeted out a copy of the letter his office sent to CEO Steve Easterbrook.

If Amazon and Disney can pay $15 an hour, so can McDonald's, which made $5.1 billion in profits last year.

My message to McDonald's CEO Steve Easterbrook: No one in America, especially those working for a profitable corporation like McDonald's, should be living in poverty. pic.twitter.com/puBA7nSRcP

"Our commitment to the communities we serve includes providing opportunities for restaurant employees to succeed at McDonald's and beyond with world-class training and education programs to help them build the skills needed for today's workforce," a McDonald's spokesperson told TheStreet.

"This year alone, we have tripled tuition assistance for restaurant employees by allocating $150 million over five years to our Archways to Opportunity education program to provide upfront college tuition assistance, earn a high school diploma, and access free education advising services. These benefits show McDonald's and its independent franchisees' commitment to providing jobs that fit around the lives of restaurant employees so they may pursue their education and career ambitions," McDonald's said.

Sanders has stepped up his insistence that large corporations pay their employees a livable wage. Sanders went back and forth with Amazon via Twitter just weeks before the company decided to raise its own pay standards.

Shares of McDonald's are up 0.22% Thursday while Amazon shares are down 2.7%.

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